EP0081663B1 - Capteur de mesure pour la détermination d'une quantité de débit d'un fluide courant - Google Patents

Capteur de mesure pour la détermination d'une quantité de débit d'un fluide courant Download PDF

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Publication number
EP0081663B1
EP0081663B1 EP82109976A EP82109976A EP0081663B1 EP 0081663 B1 EP0081663 B1 EP 0081663B1 EP 82109976 A EP82109976 A EP 82109976A EP 82109976 A EP82109976 A EP 82109976A EP 0081663 B1 EP0081663 B1 EP 0081663B1
Authority
EP
European Patent Office
Prior art keywords
oscillation
pipe portion
measuring
mode
ultrasonic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82109976A
Other languages
German (de)
English (en)
Other versions
EP0081663A1 (fr
Inventor
Hubert Lechner
Benedikt Steinle
Claudio Meisser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Building Technologies AG
Original Assignee
LGZ Landis and Gyr Zug AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LGZ Landis and Gyr Zug AG filed Critical LGZ Landis and Gyr Zug AG
Priority to AT82109976T priority Critical patent/ATE19826T1/de
Publication of EP0081663A1 publication Critical patent/EP0081663A1/fr
Application granted granted Critical
Publication of EP0081663B1 publication Critical patent/EP0081663B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details

Definitions

  • the invention relates to a sensor for determining the flow rate of a liquid flowing in a measuring tube of a pipe system according to the preamble of claim 1.
  • the measuring method is independent of the flow profile of the flowing liquid if the measuring tube is used as a waveguide and only the flat fundamental wave in the measuring tube is excited by the sound transducers.
  • a single wave type can only be excited by a sound source that generates a potential distribution corresponding to the wave type.
  • the piston oscillator represents such a sound source, but it is difficult to achieve in the frequency range of ultrasound.
  • a sound source creates a mixed wave, i.e. a combination of different spatial wave types, each wave having its own, flow-dependent phase velocity.
  • the harmonics of such a mixed wave can cause considerable measurement errors, especially in the area of laminar flows.
  • the ends of the measuring tube are provided with openings or slots or on the outside with pins.
  • the flow profiles can also be influenced with the aid of a web in the measuring tube formed by a spoke or by a partition.
  • the object of the present invention is to dampen or switch off the influence of the harmonics on the measuring accuracy without fundamentally increasing the pressure losses and the susceptibility to faults.
  • a measuring tube of a tube system, not shown, of a sensor for measuring the flow rate of a liquid is designated by 1 in FIG. 1.
  • two ultrasonic transducers 2, 3 are arranged in front of the measuring tube at a distance b, which work as transmitters and receivers of ultrasonic signals U 1 and U 2 .
  • the flow liquid is fed in and out of the measuring tube 1 at the end or on the side.
  • the measuring range comprises laminar flow 4 and turbulent flow 5.
  • r denotes the diameter coordinate of the measuring tube 1, v the particle velocity of the liquid and w the flow velocity.
  • the ultrasonic transducers 2 and 3 also excite harmonics in the measuring tube 1, of which the first harmonic 7 and the second harmonic 8 are shown.
  • the pointer diagram in FIG. 2 shows the conditions in the transducer with the pointer fully extended when the liquid is at rest, ie not flowing.
  • the received signal U 2 is composed of a fundamental wave contribution G and a harmonic contribution O, which are mutually shifted in phase.
  • the phase angle y between the pointer of the received signal U 2 and the pointer of the harmonic contribution 0 is a function of the distance b between the two ultrasonic transducers 2, 3.
  • phase differences occur in the quantities mentioned because of the different signal propagation times downstream and upstream.
  • the angle ⁇ between the pointers of the fundamental wave contributions G 'and G is proportional to the average velocity w of the flowing liquid and thus independent of the flow profile.
  • the angle ⁇ between the pointers of the harmonic contributions O' and 0" is from the maximum flow velocity W max and thus dependent on the flow profile.
  • the angle E 'of the received signals U' 2 and U " 2 is determined.
  • This angle E 'and thus also the measurement result is then independent of the flow profile if the distance b is selected such that the phase angle y is approximately the same when the flow liquid is at rest.
  • d (W max ) has no influence on ⁇ '
  • W max is not very different from the mean flow velocity w
  • the angle 8 (W max ) is also not very different of s (w), ie of the angle of the fundamental wave contributions G ', G ".
  • the harmonic contribution 0 can be kept small if the ultrasonic transducers 2, 3 are each provided with at least one partial electrode 10, so that they have a single resonance behavior with an approximately bell-shaped oscillation shape, and / or if the measuring tube 1 is covered with thin walls and / or sound absorbing and / or is lined.
  • the described choice of the distance b between the two ultrasonic transducers 2, 3 allows the influence of the harmonics during operation of the transmitter to be reduced or even switched off, and thus the measurement error to be reduced, with neither pressure losses in the system occurring nor the susceptibility to faults being increased.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
  • Automatic Analysis And Handling Materials Therefor (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Claims (4)

1. Capteur de mesure pour un dispositif servant à déterminer la quantité de liquide circulant dans un système à tube, sur la base de la différence des temps de transit d'impulsions ultrasoniques dans la direction d'écoulement et dans la direction opposée, comportant deux transducteurs ultrasoniques (2, 3), qui sont disposés sur des extrémités opposées d'un élément (1) d'un tube de mesure du système à tube et peuvent fonctionner respectivement en tant qu'émetteur et récepteur et qui, lors du fonctionnement à l'émission, excitent dans l'élément du tube de mesure, des types d'oscillations qui contiennent respectivement une onde de base spatiale (6) possédant un profil essentiellement plat sur la section transversale de l'élément du tube de mesure, ainsi que des ondes spatiales (7, 8) qui sont des ondes harmoniques de ces ondes de base, et qui, pendant le fonctionnement à la réception, produisent un signal de sortie (U2) correspondant au type d'oscillations respectivement reçu, caractérisé en ce que, dans le cas de l'excitation de types d'oscillations avec une composante d'onde harmonique inférieure ou supérieure à la composante d'onde de base, les deux transducteurs ultrasoniques (2, 3) sont disposés à une distance réciproque telle que l'angle de phase (y) entre les deux oscillations ultrasoniques du type d'oscillations reçu et de la composante d'onde harmonique pour ce type d'oscillations est égal approximativement à 90° ou à 0° dans le cas d'un liquide au repos.
2. Capteur de mesure selon la revendication 1, caractérisé en ce que les transducteurs ultrasoniques (2, 3) sont munis d'électrodes partielles (10) de telle sorte qu'ils possèdent un comportement de résonance individuelle présentant une forme d'oscillation approximativement en cloche.
3. Capteur de mesure selon l'une des revendications 1 ou 2, caractérisé en ce que l'élément (1) du tube de mesure possède une paroi mince.
4. Capteur de mesure selon l'une des revendications 1 à 3, caractérisé en ce que l'élément (1) du tube de mesure possède un revêtement et/ou un habillage insonorisant.
EP82109976A 1981-12-14 1982-10-28 Capteur de mesure pour la détermination d'une quantité de débit d'un fluide courant Expired EP0081663B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109976T ATE19826T1 (de) 1981-12-14 1982-10-28 Messwertgeber zur bestimmung der durchflussmenge einer stroemenden fluessigkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7951/81A CH654410A5 (de) 1981-12-14 1981-12-14 Messwertgeber zur bestimmung der durchflussmenge einer stroemenden fluessigkeit.
CH7951/81 1981-12-14

Publications (2)

Publication Number Publication Date
EP0081663A1 EP0081663A1 (fr) 1983-06-22
EP0081663B1 true EP0081663B1 (fr) 1986-05-14

Family

ID=4332865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109976A Expired EP0081663B1 (fr) 1981-12-14 1982-10-28 Capteur de mesure pour la détermination d'une quantité de débit d'un fluide courant

Country Status (4)

Country Link
EP (1) EP0081663B1 (fr)
AT (1) ATE19826T1 (fr)
CH (1) CH654410A5 (fr)
DE (1) DE3271191D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9205148D0 (en) * 1992-03-10 1992-04-22 Smiths Industries Plc Liquid level gauging
DE59308386D1 (de) * 1993-01-11 1998-05-14 Landis & Gyr Tech Innovat Messwertgeber mit Ultraschallwandler
BR9406377A (pt) * 1993-03-09 1996-01-16 Commw Scient Ind Res Org Supressão de modo em condutos de medição de fluidos
DE10235032B3 (de) 2002-07-31 2004-04-08 Hydrometer Gmbh Verfahren zum Betrieb eines Ultraschall-Durchflußmessers und entsprechender Ultraschall-Durchflußmesser

Also Published As

Publication number Publication date
DE3271191D1 (en) 1986-06-19
EP0081663A1 (fr) 1983-06-22
CH654410A5 (de) 1986-02-14
ATE19826T1 (de) 1986-05-15

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